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- Title
Influence of operational mode, temperature, and planting on the performances of tidal flow constructed wetland.
- Authors
Ye, Jie; Zhang, Panyue; Song, Yonghui; Gao, Hongjie; Peng, Jianfeng; Fang, Wei; Zeng, Guangming
- Abstract
In order to investigate the effect of operational mode, temperature, and planting on the performance of tidal flow constructed wetland (TFCW), four lab-scale units were operated in parallel experiments. They were operated in three cycles d−1tidal flow mode with planting (3TF+P), three cycles d−1tidal flow mode without planting (3TF), one cycle d−1tidal flow mode with planting (1TF+P), and continuous flow mode with planting (CF+P), respectively. The results demonstrated that the multi-cycle tidal flow operational mode promoted the biofilm growth and pollutant removal with the low relative clogging coefficient (RCC) of 21.42% during the whole experimental period. The average COD,-N, and-P area removal rate in 3TF+P reached 18.00, 2.38, and 0.24 g m−2 d−1, respectively. Meanwhile, the influence of low temperature on the performance of TFCW in the winter was partially compensated by the multi-cycle operational mode, which made the performance of TFCW more stable than that of other systems under temperature variation. PlantingCanna indicaL.(Cannaceae) led to an increase in average area removal rate of N with 24.17%. The net uptake of N by planting was 0.35 g m−2 d−1, which accounted for 17.95% of the total nitrogen removal. Besides the direct uptake, the combination of aerobic zone close to rhizosphere and anaerobic zone around rhizosphere may also play an important role in the nitrification–denitrification process. The direct P removal byCanna indicaL. (Cannaceae) was quantified as 0.01 g m−2 d−1, which only accounted for 4.17% of the-P removal.
- Subjects
CONSTRUCTED wetlands &; the environment; NITROGEN removal (Water purification); CANNA; PHYSIOLOGICAL transport of oxygen; PHYSIOLOGICAL effects of temperature; BIOFILMS; DENITRIFICATION
- Publication
Desalination & Water Treatment, 2016, Vol 57, Issue 17, p8007
- ISSN
1944-3994
- Publication type
Article
- DOI
10.1080/19443994.2015.1055310